Lakes / Colorado / Weld County / McGrew Reservoir
McGrew Reservoir, Colorado
116 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
40.70 degrees N, 104.62 degrees W - Weld County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How McGrew Reservoir Stacks Up
- Larger than 70% of the 778 lakes counted in Colorado.
- About 58 miles from Boulder, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Thomas Lake Reservoir | Weld | 3.4 mi | 25 acres |
| Owl Creek Reservoir | Weld | 5.6 mi | 92 acres |
| Antelope Reservoir | Weld | 5.7 mi | 47 acres |
| Clark Lake | Weld | 9.5 mi | 35 acres |
| Long Lake | Weld | 13 mi | 84 acres |
| Cozzens Lake | Weld | 14 mi | 43 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About McGrew Reservoir
How Big Is McGrew Reservoir?
McGrew Reservoir covers 116 acres in Weld County, Colorado.
What Is the Largest Lake in Weld County?
Riverside Reservoir is the largest lake in Weld County, at 3,633 acres.
Largest Lakes in Colorado
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | John Martin Reservoir | Bent | 11,686 acres | - |
| 2 | Blue Mesa Reservoir | Gunnison | 8,944 acres | - |
| 3 | Lake Granby | Grand | 7,075 acres | - |
| 4 | Lake Meredith | Crowley | 5,539 acres | - |
| 5 | Adobe Creek Reservoir | Bent | 4,770 acres | - |
All 778 Colorado lakes ranked by surface area
Sources: USGS NHD (The National Map NHD MapServer layer 12) named waterbodies FTYPE 390/436; counties via Census point-in-polygon lake data (ID 120639636). Verified October 30, 2026.